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Title:
COMMUNICATION FILTER
Document Type and Number:
Japanese Patent JP2017228747
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a communication filter capable of selectively letting a signal in a desired frequency band pass in a broadband frequency band and attenuating unnecessary signals.SOLUTION: A communication filter has radio wave transmissivity in a state where a magnetic field is not applied, and does not have radio wave transmissivity in a state where a magnetic field is applied. The communication filter includes: magnetic particles of which at least part of surfaces are covered with a surface active agent and of which an average primary particle diameter is 5-55 nm; and a binder. It is desirable that the content of the magnetic particles is 20-90 mass% of the whole amount of the communication filter.SELECTED DRAWING: None

Inventors:
ISHIZAKI HIROHISA
OCHIAI AKIRA
Application Number:
JP2016126018A
Publication Date:
December 28, 2017
Filing Date:
June 24, 2016
Export Citation:
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Assignee:
SOMAR CORP
International Classes:
H01F1/37; H01F1/34
Domestic Patent References:
JPH04120298U1992-10-27
JPH0344100A1991-02-25
JP2005286306A2005-10-13
JP2011207731A2011-10-20
JP2009058936A2009-03-19
JP2008203848A2008-09-04
JPH04228502A1992-08-18
Foreign References:
WO2015008842A12015-01-22
US20050238858A12005-10-27
US20090034900A12009-02-05
WO2007032149A12007-03-22
US20080198109A12008-08-21



 
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